and timely compliance with each such requirement). All maintenance procedures
shall be performed by properly trained, licensed, and certified maintenance
sources and personnel utilizing replacement parts approved by the FAA and the
manufacturer of (as applicable) the Airframe, the Engine or any Part. Without
limiting the foregoing, Lessee shall comply with all airworthiness directives
by causing compliance to such bulletins and directives to be completed, as and
when required thereby, through corrective modification in lieu of operating
manual restrictions.